Welcome, Drumpot!

I'm sorry I don't have any suggestions for you because it sounds as if you're very uncomfortable.

I'm assuming you've already looked into any medicines or supplements you've been taking. If you don't find any that might be causing your problems, how about interactions between some of them? It will take some careful digging to get at this information but it's the obvious place to start, IMO.

And have you looked at your diet? Sometimes there's a nutrition imbalance that can cause severe symptoms.

That wait for a neurologist seems to be typical but it's too bad. Specialists often have long waiting lists. You could try asking that doctor's office to let you know if they've had a cancellation so you can be seen earlier.